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The C# CGAffineTransform.Scale method multiplies the matrices in the reverse order compared to the ObjectiveC CGAffineTransformScale method.
You can get the expected behavior in C# by doing this:
transform = CGAffineTransform.Multiply (CGAffineTransform.MakeScale (1.0f, -1.0f), transform);
Admittedly this difference is unfortunate, but unfortunately we can't change it now without breaking lots of code.
A new overload has been introduced that behaves like the native CGAffineTransformScale function.
See bug #19341 for more information.
*** This bug has been marked as a duplicate of bug 19341 ***